On the aerodynamics of variable-geometry oval-trajectory Darrieus wind turbines |
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Authors: | FL Ponta JJ Seminara AD Otero |
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Affiliation: | aCollege of Engineering, University of Buenos Aires, Paseo Colón 850, Buenos Aires C1063ACV, Argentina;bDepartment of Mechanics and Aeronautics, University of Rome - ‘La Sapienza’, Via Eudossiana 18, Rome 00184, Italy |
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Abstract: | A new computational model for the aerodynamics of vertical-axis wind turbines is introduced. It is based on the double-multiple streamtube concept and it incorporates the capacity of dealing with rotors whose blades follow oval-trajectories at variable setting-angles. We applied this model to the study of the aerodynamics of an innovative concept in extra-large wind-power plants: the VGOT (variable-geometry oval-trajectory) Darrieus wind turbine. Due to the especial geometric characteristics of the VGOT Darrieus, it was necessary to propose three new non-dimensional parameters to quantify its performance under different wind-conditions: the equivalent power coefficient, the equivalent solidity coefficient and the trajectory efficiency. We show some numerical results testing several rotor configurations working under different wind scenarios. |
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Keywords: | Innovative concepts Vertical-axis wind turbine (VAWT) VAWT aerodynamics Darrieus rotors Double-multiple streamtube model |
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